72. NEW YORK STATE MUSEUM 



small cracks when rapidly cooled from that temperature. Cracks 

 appeared in the cubes, when heated to 850 , and under the flame and 

 water test the granite was badly broken as was the case with all 

 the cubes of igneous rocks that were subjected to that test. 



The absorption of 1.55 per cent as given by Smock seems to be 

 erroneous, perhaps due to the shifting of the decimal point. So 

 large a ratio is seldom found in any granite. Physical tests of the 

 granites by the writer gave the following values : specific gravity 

 2.71; ratio of absorption .171 per cent; pore space .462 per cent. 

 In his " Building and Ornamental Stones of Canada," Parks in- 

 cludes the following data for the Kingston granite which apparently 

 is almost identical in composition with the Grindstone granite; 

 specific gravity 2.68; ratio of absorption .119 per cent; pore space 

 .319 per cent; crushing strength 30,421 pounds a square inch. 



Kelly quarry 



Most of the stone shipped from the island in recent years has 

 come from the Kelly quarry. This is also known as the Chicago 

 Granite Company's quarry. It was opened about 1883 and worked 

 by that company for several years. The present owner is H. B. 

 Kelly of Clayton. The quarry lies on the southern and western 

 slopes of a hill which fronts the little bay reaching southward 

 toward Thurso. It is opened in two benches with a total height 

 of about 75 feet and a length of over 200 feet. The rock has a 

 rather coarse grain and is thoroughly massive. The only defect is 

 the presence of rounded inclusions, or knots, of darker, finer crys- 

 talline rock which cause some waste in the quarrying of dimension 

 stone. The jointing is not particularly well defined or regular. 

 The principal courses are N. 75 ° E. and north-south, with less 

 plainly marked series N. 35 E. and N. 50 W. The joints are 

 widely spaced and permit the quarrying of blocks of large size. 

 Sheeting is absent though there is an imperfect division along a 

 plane which dips 15 or so to the north. 



The present equipment includes one 40-foot derrick. The ship- 

 ping dock is a few hundred feet north of the quarry and connected 

 by a tramway. The quarry lands compose about 5 acres. 



Paving blocks were the principal product made by the Chicago 

 Granite Company. They were shipped chiefly to cities on the 

 Great Lakes. Under the present ownership, monumental and build- 

 ing stock are quarried on a small scale. Several buildings along 

 the St Lawrence have been constructed of this granite. 



